What you’ll learn4 learning objectivesChoose one objective for a focused lesson, or study the complete topic.12.3.1Paper chromatography is used to• Describe how paper chromatography is used to separate mixtures of soluble coloured substances, using a suitable solventSyllabus objective12.3.2Interpret simple chromatograms to• Interpret simple chromatograms to identify: (a) unknown substances by comparison with known substances (b) pure and impure substancesSyllabus objective12.3.3Paper chromatography is used to• Describe how paper chromatography is used to separate mixtures of soluble colourless substances, using a suitable solvent and a locating agent Knowledge of specific locating agents is not requiredSyllabus objective12.3.4And use the equation for Rf: Rf =• State and use the equation for Rf: Rf = distance travelled by substance distance travelled by solventSyllabus objective